Abstract: Li-2 well is located in the nose structural zone of southern steep slope of Biyang depression. The lower part of the bedrock lithology is mainly marble,with developed frac-tures and pores,belonging to good reservoirs. Aiming at the technical difficulties such as long cementing interval,high cementing pressure,easy mudloss and easy pollution,the relative research and analysis have been carried out. The ce-menting technology combining stage cementing distributor,outside casing packer and leak-proof toughened cement slurry together has been adopted,which will achieve obvious economic benefits,reduce security risks,improve cementing quality and effectively protect fractured rock reservoir.